Santa is trapped in a bunch of snow and in need of your help. Blow the snow balls up with bombs, rockets and many more weapons which you get to buy in between levels. After you blow up the snow and free santa he drops many gifts which you get to collect and then upgrade your weapons with them later on. There are lots of achievements shown on the christmas tree which also reward you once you complete them. You don't have to necessarily blow up everything on the screen but if you do so the reward will be better.